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Epic exoplanet 64 EP

HATS-27 b

RA 193.5525° · Dec -46.5877° · exoplanet

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Score breakdown

· 8 badges
64 pts · Epic
Epic 78 pts → Anomaly
  • Lava world +14
  • Puffy low-density world +12
  • Tidally locked +10
  • Eccentric orbit +9
  • Distant (over 1,000 light-years) +6
  • Confirmed exoplanet +5
  • Gas giant +4
  • Blasted by starlight +4
Total score 64

14 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Distant (over 1,000 light-years) · +6
  • Gas giant · +4
  • Lava world · +14
  • Eccentric orbit · +9
  • Tidally locked · +10
  • Puffy low-density world · +12
  • Blasted by starlight · +4

Trivia

What makes it special

  • Lava world. Its surface is almost certainly an ocean of molten rock, kept liquid by the star it hugs.

Hard to believe

  • It would float. It is less dense than water. Drop it in a big enough ocean and the whole world would bob on the surface.

What it actually is

  • Hugging its star. It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.
  • What it is made of. Lighter than Neptune — a puffed-up ball of hydrogen and helium with no surface anywhere on it to stand on.

Sense of scale

  • In perspective. Far away by human standards, yet still a local address inside the Milky Way's spiral arms.

Find it in the sky

  • How to spot it. At magnitude 12.8 it is far too faint for the eye: this one belongs to cameras and long exposures.
  • Southern sky. It rides the southern half of the sky — an easier target the further south you are.
  • Best time of year. It stands highest in the middle of the night around April — that's when to go looking.

Properties

density gcc
0.18
diameter km
214476.3687
discovery facility
HATSouth
discovery method
Transit
discovery year
2016
dist ly
2664.6554
eccentricity
0.581
eq temp k
1659
host star teff
6438
inclination
87.3
insolation
1342.5733
mag
12.782
mass earth
168.4499
name
HATS-27 b
orbital period days
4.637
radius earth
16.8135
semi major au
0.0611
spect
F
sys num planets
1
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About HATS-27 b

HATS-27 b is an epic exoplanet. It lies about 2,664.7 light-years from Earth, shines at apparent magnitude 12.78, has spectral type F and has an equilibrium temperature near 1,659 K.

Its surface is almost certainly an ocean of molten rock, kept liquid by the star it hugs.

How to see it

At apparent magnitude 12.78, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, HATS-27 b is best seen from a dark site away from city lights, and when it is above the horizon depends on your latitude and the time of year. The visibility panel above works out tonight's viewing window for your saved location.

Why HATS-27 b is an epic exoplanet

HATS-27 b scores 64 points on Spacedle's rarity scale, which places it in the epic tier. Another 14 points would lift it into a rarer tier.

That score comes from 8 science badges — Confirmed exoplanet, Distant (over 1,000 light-years), Gas giant, Lava world, Eccentric orbit, Tidally locked, Puffy low-density world and Blasted by starlight — each earned for a real, measurable property of the object. Rarity on Spacedle is never random: the more remarkable an object's astrophysics, the more badges it collects, the higher it scores, and the rarer it ranks.